relax SVN archive

Added all the files, by 'svn cp', needed for the 1.2.10 branched ellipsoidal CS tensor code.

This is guessing the origin of files in https://www.ncbr.chemi.muni.cz/~kada/relax-1.2.10_cst.tar.
This maths_fns/ code comes from Pavel Kaderavek <kada att chemi dot muni dot cz>.

Created a branch for incorporating the ellipsoidal CS tensor code from Pavel and Petr.

This branch will incorporate the code linked at:
https://mail.gna.org/public/relax-devel/2009-01/msg00113.html

Fixes for the system test catching Tyler Reddy's bug report at https://gna.org/bugs/?12487.

Fix for the call to generic_fns.structure.main.read_pdb() in __load_structure().

This fixes the loading of relax 1.2 results files.

Fix for the calls to structure.load_spins().

The combine_models flag has to be set to False, to prevent the atom position from being averaged.

Fix for the call to structure.read_pdb() in the lactose N-state model system test.

The molecule name must be explicitly set so that the same molecule in different models has the same
name.

Expanded the structural data validate() method to check molecule names.

Bug fix for __update_model(). cdp.structure.num_structures() no longer exists.

Fixes for the lactose N-state model system test.

The structures from different PDB files are now being sent to different models.

Updates for the renaming to bmrblib.